CN101753053A - Hybrid cascade multilevel converter - Google Patents
Hybrid cascade multilevel converter Download PDFInfo
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- CN101753053A CN101753053A CN200810204472A CN200810204472A CN101753053A CN 101753053 A CN101753053 A CN 101753053A CN 200810204472 A CN200810204472 A CN 200810204472A CN 200810204472 A CN200810204472 A CN 200810204472A CN 101753053 A CN101753053 A CN 101753053A
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- inverter
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- mid point
- brachium pontis
- bridge circuit
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Abstract
The invention discloses a hybrid cascade multilevel converter, which belongs to the technical field of converters and comprises inverters and an H-bridge circuit, wherein the inverter is a four-level inverter; at least two inverters are provided and respectively called as a first inverter and a second inverter; a midpoint of a first bridge arm of the first inverter is connected with a midpoint of a first bridge arm of the second inverter in series; at least one H-bridge circuit is provided; and a midpoint of a first bridge arm of the H-bridge circuit is connected with a midpoint of a second bridge arm of the first inverter in series. The hybrid cascade multilevel converter has the benefits that the hybrid cascade multilevel converter is formed by cascading a multilevel converter and an H-bridge converter which are asymmetrical, and the converter can output multiple levels through the pulse width modulation (PWM) technology, thereby improving the quality of the output electric energy, reducing the output harmonic wave and improving the system reliability.
Description
Technical field:
The present invention relates to the converter technical field, and be particularly related to a kind of multi-level converter.By asymmetric multi-level converter and the cascade of H bridge converter are constituted hybrid cascade multilevel converter, by pulse modulation technology (PWM), make this converter can export a plurality of level again, thereby improve the quality of power supply of output, reduce output harmonic wave, improve the reliability of system.
Background technology:
Multi-level converter characteristics become the focus of current research because the distortion of its output waveform is little, dv/dt is little and the EMI of system is little etc., and more and more widely be applied to that heavy-duty motor drives and aspects such as AC and DC power transmission.But all there is various shortcoming in present multi-level converter, especially when the output level number increases, system topology and control complexity significantly increase, and also having the unbalanced problem of capacitance voltage for striding capacitance formula multi-level converter, these problems all can reduce the reliability of system greatly.
With respect to diode case bit-type and striding capacitance type multi-level converter, cascade connection type topological transformation utensil has the device that needs minimum number, does not need a large amount of clamping diodes and striding capacitance, is easy to modularization and is easy to adopt advantages such as soft switch technique, is suitable for the electrical network interface.But cascade connection type topological transformation device needs a plurality of direct voltage sources.When adopting uncontrollable rectification to obtain these DC source,, adopt multipleization of the tortuous transformer of many windings to realize usually for reducing Harmonic Interference to electrical network.This volume of transformer is huge, cost height, difficult design.On the other hand, because the restriction of its structure is difficult to realize four quadrant running.
Application number is: the Chinese patent of ZL200810105139.7 discloses the single-phase circuit topology structure that a kind of clamped multi-level converter is used, and this structure is characterised in that: DC side has three electric capacity, and dc voltage is 4V
Dc, the electric capacity that mediates is realized 2V
DcVoltage, with four diode clamps, outlet side by switch combination, makes each switching device bear 1V with a clamping capacitance clamp at input side
DcTo obtain the output combination of five kinds of level.Though the circuit structure of this patent is simplified greatly, the device withstand voltage level is low, can accomplish not contain the direct series connection of device, the stationary problem that does not turn on and off.But this patent can only obtain the output combination of five kinds of level, and the scope of level output is low.
Bright content:
The object of the present invention is to provide a kind of hybrid cascade multilevel converter, defective such as low to solve the level output area that exists in the existing converter technology, the output quality of power supply is low, and output harmonic wave is many.
To achieve these goals, technical scheme of the present invention is:
Hybrid cascade multilevel converter comprises inverter, H bridge circuit, and described inverter is four electrical level inverters, it is characterized in that, described inverter comprises two at least, is called first inverter and second inverter; The input of described inverter comprises two power supplys that are in series, be called first power supply and second source, described two power supplys are a capacitor in parallel respectively, described inverter has also comprised four triodes of a diode respectively in parallel, two backs that are in series in the described triode are in parallel with described first power supply, and are in parallel with described second source after described other two triodes are in series; The mid point of first brachium pontis of described first inverter is connected with the mid point of first brachium pontis of described second inverter; Described H bridge circuit comprises one at least, the input of described H bridge circuit comprise a parallel connection power supply of one capacitor, four in parallel respectively the triode of a diode, two backs that are in series in the described triode are in parallel with described power supply, and are also in parallel with described power supply after described other two triodes are in series; The mid point of the mid point of described H bridge circuit first brachium pontis and second brachium pontis of described first inverter is in series.
Described multi-level converter is by a described H bridge circuit, first inverter and one second inverter, constituted the cascade unit of a single-phase output, and the mid point of the mid point of described H bridge circuit first brachium pontis and second brachium pontis of described first inverter is in series, and the mid point of first brachium pontis of described first inverter is connected with the mid point of first brachium pontis of described second inverter.
Cascade unit by a plurality of single-phase outputs has constituted a multi-level converter of exporting more than the two-phase, and this multi-level converter comprises plural H bridge circuit, and the mid point of second brachium pontis of all H bridge circuits is in series successively.
The present invention compares with existing converter has following advantage:
(1) single-phase Mixed cascading inverter circuit is made of two asymmetric four level circuits and the cascade of a H bridge circuit.The output of inverter circuit is the output stack sum of three cascade unit, can realize many level outputs by different modulator approaches.The voltage ratio that changes the input direct current can change the output level number, can export 27 kinds of level at most;
(2) can be this single-phase inversion circuit by constituting heterogeneous inverter circuit.Can be for the symmetrical load of n (three-phase or more than) by n directly power supply mutually; For asymmetrical load, can control every circuitry phase respectively by the power supply of n phase n+1 (three-phase and four-line) line;
(3) can adopt pulse modulation technology to inverter circuit;
(4) in the Mixed cascading inverter circuit, some device bears higher voltage, but the frequency of switch is low; Some device bears lower voltage, but the switching frequency height, so can select different devices.
Beneficial effect: hybrid cascade multilevel converter of the present invention, by asymmetric multi-level converter and the cascade of H bridge converter are constituted hybrid cascade multilevel converter, again by pulse modulation technology (PWM), make this converter can export a plurality of level, thereby improve the quality of power supply of output, reduce output harmonic wave, improve the reliability of system.
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the electrical block diagram of single-phase output among the present invention;
The electrical block diagram that Fig. 2 exports mutually for N among the present invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
With reference to figure 1, comprise three unit among the figure, be respectively: unit A0, unit A1 and unit A2, circuit is unit cascadedly to constitute by these three among the figure.Wherein unit A0 is a traditional H bridge circuit, and unit A1 and unit A2 then are asymmetric four level inverter circuits.V among the figure
A01, V
A11, V
A12, V
A21And V
A22Being the DC power supply of opposition, can be that the transformer rectification of solar energy, wind energy, fuel cell, storage battery and isolation obtains.
The output of single-phase Mixed cascading inverter circuit can be represented by formula 1 by the output stack gained of three separate stage receipts or other documents in duplicate units:
v
ag＝v
ag0+v
ag1+v
ag2 (1)
Wherein, v
AgBe the output of inverter, v
Ag0, v
Ag1And v
Ag2Be respectively the output of unit A0, A1 and A2.
For unit A0, establish v
A01=E, then v
Ag0Can be-E, 0 and three level of E;
For unit A1, establish v
A11=E, v
A12=E, then v
Ag1Can for-2E ,-E, 0 and four level of E;
Equally, for unit A2, establish v
A21=E, v
A22=E, then v
Ag2Also can for 2E, E, 0 and-four level of E.
Combination of the output of three cascade unit process and stack, v
AgCan export at most-4E ,-3E ,-2E ,-E, 0, E, 2E, 3E and nine level of 4E, it is detailed 0, the combination of E, 2E, 3E and 4E is as shown in table 1, can provide equally-4E ,-3E ,-2E and-combination of E.As can be seen from the table, there is redundant combination in this inverter circuit, in side circuit, can reduce the number of times of switching device switch by selecting different combinations, raises the efficiency thereby reduce loss.
Embodiment 2
With reference to figure 1, when changing, the voltage ratio of DC power supply can obtain different output level numbers.
If V
A01=7E, then v
Ag0Can be-7E, 0 and three level of 7E;
If V
A11=4E, V
A12=E, then v
Ag1Can for-5E ,-E, 0 and four level of 4E;
If V
A21=E, V
A22=E is v then
Ag2Also can for 2E, E, 0 and-four level of E.
This moment inverter circuit can export at most 13E, 12E, 11E, 10E, 9E, 8E, 7E, 6E, 5E, 4E, 3E, 2E, E, 0 ,-13E ,-12E ,-11E ,-10E ,-9E ,-8E ,-7E ,-6E ,-5E ,-4E ,-3E ,-2E and-E totally 27 level.Its detailed 13E, 12E, 11E, 10E, 9E, 8E, 7E, 6E, 5E, 4E, 3E, 2E, E and 0 combination are as shown in table 2, can provide equally-13E ,-12E ,-11E ,-10E ,-9E ,-8E ,-7E ,-6E ,-5E ,-4E ,-3E ,-2E and-combination of E.
Implement 3
Referring to Fig. 2, the present invention can realize heterogeneous output by combination, and Fig. 2 has provided the structure chart that N exports mutually.As can be seen from the figure this polyphase circuit can be given the electric of symmetry.When every phase inverter circuit is controlled separately, can give asymmetrical electric by center line.Load is a motor 2 among the figure.
Table 1 for single-phasely be output as 0, the level combination of E, 2E, 3E and 4E
Table 2 for single-phasely be output as 0, E, 2E, 3E, 4E, 5E, 6E, 7E, 8E, 9E, 10E, 11E, 12E and the combination of 13E level
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. hybrid cascade multilevel converter comprises inverter, H bridge circuit, and described inverter is four electrical level inverters, it is characterized in that, described inverter comprises two at least, is called first inverter and second inverter; The input of described inverter comprises two power supplys that are in series, be called first power supply and second source, described two power supplys are a capacitor in parallel respectively, described inverter has also comprised four triodes of a diode respectively in parallel, two backs that are in series in the described triode are in parallel with described first power supply, and are in parallel with described second source after described other two triodes are in series; The mid point of first brachium pontis of described first inverter is connected with the mid point of first brachium pontis of described second inverter; Described H bridge circuit comprises one at least, the input of described H bridge circuit comprise a parallel connection power supply of one capacitor, four in parallel respectively the triode of a diode, two backs that are in series in the described triode are in parallel with described power supply, and are also in parallel with described power supply after described other two triodes are in series; The mid point of the mid point of described H bridge circuit first brachium pontis and second brachium pontis of described first inverter is in series.
2. hybrid cascade multilevel converter according to claim 1, it is characterized in that, described multi-level converter is by a described H bridge circuit, first inverter and one second inverter, constituted the cascade unit of a single-phase output, and the mid point of the mid point of described H bridge circuit first brachium pontis and second brachium pontis of described first inverter is in series, and the mid point of first brachium pontis of described first inverter is connected with the mid point of first brachium pontis of described second inverter.
3. hybrid cascade multilevel converter according to claim 1, it is characterized in that, cascade unit by a plurality of single-phase outputs has constituted a multi-level converter of exporting more than the two-phase, this multi-level converter comprises plural H bridge circuit, and the mid point of second brachium pontis of all H bridge circuits is in series successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810204472A CN101753053A (en) | 2008-12-12 | 2008-12-12 | Hybrid cascade multilevel converter |
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|---|---|---|---|
| CN200810204472A CN101753053A (en) | 2008-12-12 | 2008-12-12 | Hybrid cascade multilevel converter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377324A (en) * | 2011-10-18 | 2012-03-14 | 吕遥 | Converter bridge arm suitable for high-voltage applications and application system thereof |
| CN102545664A (en) * | 2012-01-06 | 2012-07-04 | 浙江大学 | Bridge arm switching multi-level converter |
| CN103312209A (en) * | 2013-06-18 | 2013-09-18 | 哈尔滨工业大学 | Novel three-level voltage source inverter |
| CN103532449A (en) * | 2013-06-28 | 2014-01-22 | 哈尔滨工业大学 | Permanent magnet synchronous motor drive control system and method of cascaded multilevel converter |
| CN104184350A (en) * | 2014-07-28 | 2014-12-03 | 中国矿业大学(北京) | Large-power mixed cascading bridge-type unit power factor rectifier |
| CN106411145A (en) * | 2016-12-14 | 2017-02-15 | 国网江苏省电力公司经济技术研究院 | Inversion unit of shore power system and inversion system thereof |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN111464058A (en) * | 2020-03-10 | 2020-07-28 | 燕山大学 | Cascaded three-phase single-phase inverter parallel topology structure and control method |
-
2008
- 2008-12-12 CN CN200810204472A patent/CN101753053A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377324A (en) * | 2011-10-18 | 2012-03-14 | 吕遥 | Converter bridge arm suitable for high-voltage applications and application system thereof |
| CN102377324B (en) * | 2011-10-18 | 2013-09-04 | 吕遥 | Converter bridge arm suitable for high-voltage applications and application system thereof |
| CN102545664A (en) * | 2012-01-06 | 2012-07-04 | 浙江大学 | Bridge arm switching multi-level converter |
| CN103312209A (en) * | 2013-06-18 | 2013-09-18 | 哈尔滨工业大学 | Novel three-level voltage source inverter |
| CN103312209B (en) * | 2013-06-18 | 2016-09-14 | 哈尔滨工业大学 | The space vector modulating method of three level outputs is realized based on three-level voltage source inverter |
| CN103532449B (en) * | 2013-06-28 | 2016-02-17 | 哈尔滨工业大学 | The drive control system of permanent magnet synchronous motor of cascade multi-level converter and control method thereof |
| CN103532449A (en) * | 2013-06-28 | 2014-01-22 | 哈尔滨工业大学 | Permanent magnet synchronous motor drive control system and method of cascaded multilevel converter |
| CN104184350A (en) * | 2014-07-28 | 2014-12-03 | 中国矿业大学(北京) | Large-power mixed cascading bridge-type unit power factor rectifier |
| CN104184350B (en) * | 2014-07-28 | 2017-09-19 | 中国矿业大学(北京) | High-power Mixed cascading bridge-type Unity Power Factor PWM Rectifier Based |
| US10218285B2 (en) | 2015-10-19 | 2019-02-26 | Siemens Aktiengesellschaft | Medium voltage hybrid multilevel converter and method for controlling a medium voltage hybrid multilevel converter |
| CN106411145A (en) * | 2016-12-14 | 2017-02-15 | 国网江苏省电力公司经济技术研究院 | Inversion unit of shore power system and inversion system thereof |
| CN111464058A (en) * | 2020-03-10 | 2020-07-28 | 燕山大学 | Cascaded three-phase single-phase inverter parallel topology structure and control method |
| CN111464058B (en) * | 2020-03-10 | 2022-06-28 | 燕山大学 | Cascaded three-phase single-phase inverter parallel topology structure and control method |
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Application publication date: 20100623 |